title: Reply to Koestenberger and Ravekes.
authors.affiliation: Hospital for Sick Children, Division of Pediatric Cardiology, Toronto, Ontario, Canada. Electronic address: mark.friedberg@sickkids.ca.
authors.forename: Mark K
authors.initials: MK
authors.lastname: Friedberg
authors.forename: Eias
authors.initials: E
authors.lastname: Kassem
mesh_terms: D004452:Echocardiography / Q000379:methods*; D005260:Female; D006352:Heart Ventricles / Q000503:physiopathology*; D006801:Humans; D006976:Hypertension, Pulmonary / Q000000981:diagnostic imaging*; D008297:Male; D016278:Ventricular Function, Right / Q000502:physiology*